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Reporting Category 1

Matter and Energy

TermDefinition
Atom The smallest unit of an element that retains the properties of that element; made up of protons
Compound A substance made of two or more elements chemically bonded together in a fixed ratio
Element A pure substance made of only one type of atom
Mixture A combination of two or more substances that are not chemically bonded
Homogeneous Mixture A mixture that has a uniform composition throughout (like salt water)
Heterogeneous Mixture A mixture where different parts have different compositions (like trail mix)
Chemical Reaction A process where substances (reactants) change into new substances (products) with different properties
Conservation of Mass The law stating that mass cannot be created or destroyed in a chemical reaction; mass is conserved
Periodic Table A chart organizing all known elements by their atomic number and properties
Valence Electrons Electrons in the outermost shell of an atom that determine how it bonds with other atoms
Proton A positively charged particle found in the nucleus of an atom
Neutron A neutral particle found in the nucleus of an atom
Electron A negatively charged particle that orbits the nucleus of an atom
Acid A substance with a pH less than 7 that tastes sour and can conduct electricity
Base A substance with a pH greater than 7 that tastes bitter and can conduct electricity
pH A scale from 0-14 measuring how acidic or basic a substance is
Cohesion The attraction between water molecules that causes them to stick together
Adhesion The attraction between water and other substances
Surface Tension The force that makes water molecules at the surface stick together and form a "skin"
Photosynthesis A chemical reaction where plants use sunlight to convert carbon dioxide and water into glucose and oxygen
Chemical Formula A notation showing the types and number of atoms in a compound
Created by: user-2031328
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